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Toggle Clamping Mechanism Formula and Calculator

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Toggle Mechanism Clamping Ninety Degree Reaction Points Design Formula and Calculator

Preview: Clamping Ninety Degree Reaction Points Toggle Mechanism Calculator

Eq. 1
Q = P [ ( l + l₃ · f + 0.06 · r · f_o ) / ( l₁ - l₂ · f₁ - 0.40 · r · f_o ) ]

Eq. 2
P = Q / [ ( l + l₃ · f + 0.06 · r · f_o ) / ( l₁ - l₂ · f₁ - 0.40 · r · f_o ) ]

Figure 1
Clamping Ninety Degree Reaction Points Design

Where:

Q = force applied to handle. lbf, (N)
P = clamping force, lbf. (N)
f = coefficient of friction of contact surface = 0.1 to 0.15
f_o = coefficient of friction (axles and pivot pins) = 0.1 to 0.15
f₁ = coefficient of friction of contact surface = 0.1 to 0.15
n = efficiency coefficient, 0.98 to 0.84
l, l₁ l₂ l₃ = length as indicated. in, (mm)
r = radius of pivot hole. in, (mm)

Reference:

Handbook of Machining and Metalworking Calculations
Ron A. Walsh
2001